Input: melfas_mip4 - fix return value check in mip4_probe()

devm_gpiod_get_optional() may return ERR_PTR(-EPROBE_DEFER),
add a minus sign to fix it.

Fixes: 6ccb1d8f ("Input: add MELFAS MIP4 Touchscreen driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220924030715.1653538-1-yangyingliang@huawei.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/melfas_mip4.c

@@ -1453,7 +1453,7 @@ static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id)
 					      "ce", GPIOD_OUT_LOW);
 	if (IS_ERR(ts->gpio_ce)) {
 		error = PTR_ERR(ts->gpio_ce);
-		if (error != EPROBE_DEFER)
+		if (error != -EPROBE_DEFER)
 			dev_err(&client->dev,
 				"Failed to get gpio: %d\n", error);
 		return error;